By 'iOS', I assume you mean macOS. IOS is the operating system for iPhones and iPads. MacOS (aka: Mac OS X) is the operating system for Macs.
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Anyway, there are two shortcuts:. Command + Shift + 3. Takes a screenshot of your entire screen (equivalent to full-screen snip). Command + Shift + 4.
Takes a screenshot of a rectangular window of your choosing (equivalent to rectangular snip) You should hear a camera shutter sound when it takes the a screenshot, and by default the screenshots will be saved to your desktop. There are other hotkeys you can use in conjunction with the hotkeys above. For example, you can press Command + Shift + 4 and then hi Spacebar, and it will allow you to take a screenshot of an entire window, similar to window snip with snipping tool.